Thursday, June 15, 2023

Defense Firm Rafael Creates First Ever Hypersonic Interceptor: "Sky Sonic"


This handout image released on June 14, 2023, shows a render of the Sky Sonic anti-hypersonic missile. (Rafael)


Defense tech firm Rafael reveals first-ever hypersonic interceptor

Sky Sonic system, under development for three years, to be shown off at Paris Air Show, after Iran claimed earlier this month it built a hypersonic missile

This handout image released on June 14, 2023, shows a render of the Sky Sonic anti-hypersonic missile. (Rafael)
This handout image released on June 14, 2023, shows an artists rendition of the Sky Sonic anti-hypersonic missile. (Rafael)

Israel’s Rafael defense contractor unveiled Wednesday that it has been developing a first-of-its-kind anti-hypersonic missile defense system.

According to the company, the Sky Sonic interceptor missile, which has been in development for around three years, will be shown for the first time at the upcoming Paris Air Show next week.

The announcement comes after Iran earlier this month claimed it had developed a new hypersonic missile. Rafael officials said the company had only recently been given approval by the Defense Ministry to reveal the system.

Rafael said the Sky Sonic missile “represents a major technological leap in hypersonic missile defense.”

“Designed with exceptional maneuverability and high-speed capabilities, it effectively neutralizes hypersonic missiles [which travel at speeds of over five times the speed of sound] with unmatched precision and stealth,” it said.

The company could not provide a timeline as to when the missile will be ready to use but said it would be conducting first test flights in the near future.

This handout image released on June 14, 2023, shows a render of the Sky Sonic anti-hypersonic missile. (Rafael)

Speaking to reporters, former minister Yuval Steinitz, chairman of Rafael, said the company had identified the potential hypersonic missile threat a number of years ago and began a research and development venture.

“We are following the developments and emerging threats in the current security context and are developing the most advanced defense systems,” he said.

Steinitz noted that the company’s David Sling medium-range air defense system — already in use by the Israeli military — can technically deal with hypersonic missiles, but said the new system is designed specifically to counter that threat.

“Project Sky Sonic is an innovative, unique development of its kind for the hypersonic weapon threat,” he said.

Hypersonic weapons, which fly at speeds in excess of Mach 5, or five times the speed of sound, could pose serious challenges to missile defense systems because of their speed and maneuverability. Iran described its new missile, the Fattah, as being able to reach Mach 15.

Women look at Fattah missile in a ceremony in Tehran, Iran, Tuesday, June 6, 2023. Iran is claiming that it has created a hypersonic missile capable of traveling at 15 times the speed of sound. (Hossein Zohrevand/Tasnim News Agency via AP)

Most air defense systems operate up to an altitude of 20 kilometers, while anti-ballistic systems intercept targets outside of Earth’s atmosphere, generally above 70 kilometers.

The Sky Sonic system aims to intercept hypersonic threats within the 20-70 kilometer altitude range, where the incoming missile would likely maneuver to avoid being knocked down by traditional air defenses.

Rafael officials said the United States has shown interest in Sky Sonic.

China is believed to be pursuing hypersonic weapons, as is the US. Russia claims to already be fielding the weapons and has said it used them on the battlefield in Ukraine. However, speed and maneuverability aren’t a guarantee the missile will successfully strike a target. Ukraine’s air force in May said it shot down a Russian hypersonic Kinzhal missile with a Patriot battery.

Rafael is considered one of Israel’s premier military contractors, helping develop some of the country’s leading weapons systems, including the short-range Iron Dome air defense system and the precision-guided Spike missile.

It is also currently developing a high-powered laser interception system, dubbed Iron Beam, which has been hailed as a potential “game-changer” in the battle against projectile attacks.

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From I24:

Hypersonic missiles encompass a new threat, and is the latest weapon in the evolution of arms designed to beat interception systems like Israel's Iron Dome

Rafael Advanced Defense Systems, a leading Israeli defense technology company, on Wednesday announced the development of an advanced missile interceptor dubbed “Sky Sonic,” described as a groundbreaking defensive response to the growing threat of hypersonic missiles.

The revolutionary system will be officially unveiled for the first time next week at the Paris Air Show, one of the world’s largest aerospace exhibitions.

Rafael’s “Sky Sonic” interceptor represents a major technological leap in hypersonic missile defense. It is designed with exceptional maneuverability and high-speed capabilities, allowing it to effectively neutralize hypersonic missiles – which travel at ten times the speed of sound – with unmatched precision and stealth. 

Over the past years, the threat posed by hypersonic missiles has escalated, necessitating proactive measures to safeguard national security. Rafael is at the forefront of developing an effective solution to counter hypersonic threats, already known for its pioneering contributions in the field of defense systems such as the renowned "Iron Dome," "David's Sling," and the cutting-edge "Iron Beam" laser-based system.

"Rafael has identified a marked increase and arousing interest in the international arena with proven operational capabilities and a geopolitical reality that has created many opportunities,” Rafael’s chairman Dr. Yuval Steinitz said at a press briefing.

“We are following the developments and emerging threats in the current security context and are developing the most advanced defense systems. Project ‘Sky Sonic’ is an innovative, unique development of its kind for the hypersonic weapon threat.”

Hypersonic missiles are the latest weapon in the evolution of arms, designed to beat interception systems like the Iron Dome. They encompass a new family of threats – including hypersonic atmospheric cruise missiles, gliders, and cruisers that travel at incredible speeds while maintaining exceptional accuracy and maneuverability. Unlike ballistic missiles, hypersonic missiles have the ability to change their course mid-flight. 

Consequently, a successful defense against hypersonic threats requires a multifaceted approach that involves not only countering their speed but also effectively tracking, detecting, and intercepting their unpredictable flight paths.

Last week, Iran unveiled their new “Fattah” advanced hypersonic missile which can reportedly reach a range of up to 870 miles and is able to evade "all enemy air defense systems."

It was the first time Tehran had presented a hypersonic missile capable of reaching a speed five times greater than the speed of sound. The missile would also be able to perform erratic maneuvers inside and outside the Earth's atmosphere to thwart any type of air defense.

Video poster

"We are coming to the air show with Rafael's vast and impressive portfolio that includes systems that are at the forefront of technology. We at Rafael believe that even the seemingly impossible can be done. We have proven this in the past and will continue to prove it in the future,” said Maj. Gen. Yoav Har Even, CEO of Rafael. 

“The orders for these systems are breaking records, and for the first time, we stand on a backlog of orders of over [$11 billion]... Rafael continues to be a significant pillar in the security of the State of Israel."

Developing a comprehensive defensive response to hypersonic threats presents numerous complex challenges, including detection and tracking difficulties that necessitate a synchronized sensor system capable of accurately identifying and locating the threat throughout its trajectory. Furthermore, accurate trajectory prediction demands an interceptor that can swiftly reach the target, minimizing uncertainty associated with the target's location. Lastly, the interceptor must exhibit exceptional maneuverability and operate on a non-ballistic trajectory to effectively pursue and neutralize the hypersonic threat.

"We continue to look ahead and develop the next generations of systems to defend against the threats of tomorrow,” said Brig. Gen. Pini Yungman, vice president and head of the air defense division at Rafael.

The Paris Air Show will provide a platform for Rafael to showcase its wide range of advanced systems and capabilities. Following a four-year hiatus due to the Covid pandemic, the show will feature for the first time unique Rafael solutions and systems. Visitors to the company’s pavilion will have the opportunity to experience firsthand the "Iron Dome" system, the "David's Sling" system, the "Iron Beam" laser air defense system, as well as advanced features of the "SPIKE" missiles integrated with combat helicopters, supplementary systems for aerial platforms, and much more.

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From JPost:

Rafael Advanced Defense Systems on Wednesday announced that it is midstream in working on developing a system to shoot down hypersonic missiles, dubbing its new project the “Sky Sonic” system.

Chairman Yuval Steinitz said that the current era has more of a focus on the threat posed by hypersonic missiles.

Steinitz said that while many define any missile which can fly at a speed beyond Mach 10 as “hypersonic,” the new threat that such missiles present is their ability to maneuver and alter their trajectory.

Many countries have expressed concern that no existing air defense, including Israel’s multi-tier defenses, could contend with such a threat.

Russia, China, and Iran have all made various claims about possessing or working on developing such advanced missiles.

Artistic depiction of how innovative laser defense system would function on the battle field  (credit: Courtesy)Artistic depiction of how innovative laser defense system would function on the battle field (credit: Courtesy)

He said that the Sky Sonic defense missile system is “versatile and can hit all hypersonic missiles, flying high or low, maneuvering more or less.”

Further, the Rafael chairman said the new defense system “is already in development for a solution. If someone thought we are going downward in defense, we are deep into this.”

Next, Rafael CEO Yoav Har Even added, “We decided three years ago before the public started talking about it…we identified this as the next thing which must have a solution.”

Har Even said Rafael initiated its project for the simple reason that it fulfills the company’s two key missions: developing solutions helpful to Israel’s defense and which are at the forefront of technological development.

Steinitz said that Rafael was revealing its work on the project leading into next week’s Paris Air Show, which shows off state-of-the-art defense sector systems, and following a process to convince the Defense Ministry to approve the announcement.

Hypersonic missiles pose a unique threat

Rafael explained that the anticipated threat of hypersonic missiles would involve such threats dropping from the top of their trajectory in multiple hops, versus going high up into the atmosphere in a relatively straight line and coming back down in a similar straight line.

Such hypersonic missiles might only drop below the 20-kilometer height where existing air defense systems can hit them, at almost the last second before hitting a target.

This could defeat the mission of existing air defenses which are designed to hit missile threats during their arch trajectory going upward before they start to go downward.

Some hypersonic missiles might also be fired in more of a “line drive” fashion, closer to being fired straight across from the launch site, with much less of an arch.

These hypersonic missiles may fly above the key 20-kilometer height for existing systems to hit them during almost the entire trajectory even though they fly in more of a line-drive fashion, and with a smaller arch.

Steinitz noted that Rafael had hit a new high of NIS 40 billion in sales over the last year, a huge spike following the Russian invasion of Ukraine.

He said that Europe watched the war and realized that most of the attacks at a certain point were carried out by firing missiles, including Moscow’s claim that it was firing hypersonic missiles.

This meant new opportunities for Rafael in sales to European countries.

Rafael also discussed progress regarding its Iron Beam laser anti-missile system and its existing Iron Dome and David’s Sling anti-missile systems, noting that there would be many common features between the new Sky Sonic system and David’s Sling.

At the same time, Rafael emphasized that it is building Sky Sonic in a manner that should make it adaptable to a number of situations and scenarios.


______________________________________________________

From BreakingDefense (Seth Frantzman):

JERUSALEM — In response to what it describes as the “geopolitical reality” of hypersonic weapons, Rafael Advanced Defense Systems today announced that it is developing a new interceptor missile called Sky Sonic geared specifically at the hypersonic threat.

In a statement, the company described the missile as a “groundbreaking defensive response to the growing threat of hypersonic missiles.” The firm plans to show the weapon design off at next week’s Paris Air Show, aiming squarely at the European market.

The missile is currently being developed and has not undergone live testing yet. The multi-stage interceptor, developed for several years in secret, uses a Hit-to-Kill system that Rafael has used in other interceptors, per a company briefing held today. It is a distinct system, but in line with Rafael’s other air defense systems and missile interceptor it is designed with an open architecture to allow maximal flexibility, according to the company. Rafael has presented the project to the US and, the company said, feedback from USA has been positive.

The timing of the unveiling is notable. Just a week ago, Iran announced that it has developed a hypersonic missile called Fattah, that is a two-stage missile which exits the atmosphere and separates from a re-entry vehicle that then maneuvers toward a target. While there is some skepticism about whether Iran has that capability, it’s yet another sign of how hypersonic threats have proliferated over the last few years: Russia has used air-launched hypersonic Kinzhal missiles in Ukraine, while both China and North Korea claim to have developed hypersonic missiles.

“Rafael has identified a marked increase and arousing interest in the international arena with proven operational capabilities and a geopolitical reality that has created many opportunities. We are following the developments and emerging threats in the current security context and are developing the most advanced defense systems,” said Dr. Yuval Steinitz, Chairman of Rafael. “Project Sky Sonic is an innovative, unique development of its kind for the hypersonic weapon threat,” he said.

A “successful defense against hypersonic threats requires a multifaceted approach that involves not only countering their speed but also effectively tracking, detecting, and intercepting their unpredictable flight paths,” Rafael’s statement said.

Rafael officials described the hypersonic threat in a presentation and also showed a video of the Sky Sonic. Rafael officials stressed that “hypersonic” threats describe missiles that are not merely travelling fast (ballistic missiles travel past Mach 5) but also involve missiles that glide or maneuver. This means they bring together the threat of speed and also the kind of difficulties involved in intercepting low-flying cruise missiles that may maneuver to fly up valleys or change direction.

“Developing a comprehensive defensive response to hypersonic threats presents numerous complex challenges, including detection and tracking difficulties that necessitate a synchronized sensor system capable of accurately identifying and locating the threat throughout its trajectory,” the company said in a statement.

An interceptor launched against a hypersonic threat needs to be able to fly “swiftly” toward the target and also “the interceptor must exhibit exceptional maneuverability and operate on a non-ballistic trajectory to effectively pursue and neutralize the hypersonic threat.” The company did not give a range for the interceptor.

Company executives reiterated that they have developed a new technology with this missile, although they could not elaborate on specific aspects of that technology. Nor would the company give a range for the interceptor.

However, the company is clearly keeping both the local threat and potential exports in mind. Israel recently announced historically high defense exports of $12.5 billion. Rafael is one of Israel’s three largest defense companies and the traditional research and development center within Israel’s defense sector.

Rafael is showcasing its other systems, such as Iron Dome and David’s sling at the Paris Air Show. It will also be discussing Iron Beam, the laser air defense system that is being coupled with Iron Dome. This system is supposed to be operation in the near-term. The company says the “system delivers unparalleled accuracy in intercepting rockets, mortar projectiles, missiles, unmanned aerial vehicles (UAVs), and UAV swarms from several kilometers to a few hundred meters away. As an integral part of the comprehensive Iron Dome air defense system, the Iron Beam significantly enhances its defensive capabilities.”

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From A7:

RAFAEL Advanced Defense Systems Ltd., a leading defense technology company, announced today that it has developed an advanced interceptor, named "Sky Sonic," as a groundbreaking defensive response to the growing threat of hypersonic missiles. This revolutionary system will be officially unveiled for the first time at the Paris Air Show, one of the world's largest aerospace exhibitions, opening next week.

The Sky Sonic interceptor represents a major technological leap in hypersonic missile defense. Designed with exceptional maneuverability and high-speed capabilities, it effectively neutralizes hypersonic missiles, which travel at ten times the speed of sound, with unmatched precision and stealth. RAFAEL's booth at the Paris Air Show will showcase the interceptor, highlighting the company's commitment to pushing the boundaries of air defense technology.

Over the past years, the threat posed by hypersonic missiles has escalated, necessitating proactive measures to safeguard national security. RAFAEL, known for its pioneering contributions in the field of defense systems such as the renowned "Iron Dome," "David's Sling," and the cutting-edge "Iron Beam" laser-based system, is proud to be at the forefront of developing an effective solution to counter hypersonic threats.

Dr. Yuval Steinitz, Chairman of RAFAEL "RAFAEL has identified a marked increase and arousing interest in the international arena with proven operational capabilities and a geopolitical reality that has created many opportunities. We are following the developments and emerging threats in the current security context and are developing the most advanced defense systems. Project Sky Sonic is an innovative, unique development of its kind for the hypersonic weapon threat.

Major General Yoav Har Even, CEO of Rafael "We are coming to the air show with RAFAEL's vast and impressive portfolio that includes systems that are at the forefront of technology. We at RAFAEL believe that even the seemingly impossible can be done. We have proven this in the past and will continue to prove it in the future. The orders for these systems are breaking records and for the first time we stand on a backlog of orders of over 40 billion NIS and alongside the activity as a successful global business company, RAFAEL continues to be a significant pillar in the security of the State of Israel."

Brigadier General Pini Yungman, Executive Vice President and Head of the Air Defense Division at Rafael: "RAFAEL has achieved a reputation as a leading global manufacturer of air defense systems. From groundbreaking and operationally proven systems like the Iron Dome in its various configurations to the David's Sling and the SPYDER, we continue to look ahead and develop the next generations of systems to defend against the threats of tomorrow."

Hypersonic missiles encompass a new family of threats, including hypersonic atmospheric cruise missiles, gliders, and cruisers that travel at incredible speeds while maintaining exceptional accuracy and maneuverability. Unlike ballistic missiles, hypersonic missiles have the ability to change their course mid-flight. Consequently, a successful defense against hypersonic threats requires a multifaceted approach that involves not only countering their speed but also effectively tracking, detecting, and intercepting their unpredictable flight paths.

Developing a comprehensive defensive response to hypersonic threats presents numerous complex challenges, including detection and tracking difficulties that necessitate a synchronized sensor system capable of accurately identifying and locating the threat throughout its trajectory. Furthermore, accurate trajectory prediction demands an interceptor that can swiftly reach the target, minimizing uncertainty associated with the target location. Lastly, the interceptor must exhibit exceptional maneuverability and operate on a non-ballistic trajectory to effectively pursue and neutralize the hypersonic threat.

The Paris Air Show, the world's largest aerospace exhibition, will provide an excellent platform for RAFAEL to showcase its wide range of advanced systems and capabilities. Following a four-year hiatus due to the global pandemic, the show will feature for the first time unique RAFAEL solutions and systems. Visitors to the RAFAEL pavilion will have the opportunity to experience firsthand the "Iron Dome" system, the "David's Sling" system, the "Iron Beam" laser air defense system, as well as advanced features of the "SPIKE" missiles integrated with combat helicopters, supplementary systems for aerial platforms, and much more.

The "David's Sling" system, developed jointly by RAFAEL and the American company Raytheon, is a highly advanced solution for intercepting medium to long-range rockets, missiles, and cruise missiles. It utilizes a Hit-to-Kill mechanism, making it the world's leading interceptor. Equipped with a multi-stage interceptor that boasts rapid maneuverability, the system incorporates two targeting and guidance systems—a radar and an electro-optical sensor—at its nose tip. These cutting-edge technologies establish "David's Sling" as a global breakthrough in missile defense.

RAFAEL's "Iron Beam" system is set to be the world's first operational High Energy Laser Weapon System (HELWS). It has successfully intercepted a wide range of aerial threats and is nearing its deployment phase. The "Iron Beam" system delivers unparalleled accuracy in intercepting rockets, mortar projectiles, missiles, unmanned aerial vehicles (UAVs), and UAV swarms from several kilometers to a few hundred meters away. As an integral part of the comprehensive "Iron Dome" air defense system, the "Iron Beam" significantly enhances its defensive capabilities.

The SPIKE missile family, renowned for its electro-optical capabilities, demonstrates remarkable effectiveness in various environments, including sea, air, and land. With a range of up to 32 km in-ground launch and 50 km in air launch, the advanced SPIKE missiles offer unparalleled speed, accuracy, and the ability to neutralize multiple targets simultaneously. These state-of-the-art missiles empower combat helicopters with extended range and mission capabilities, revolutionizing their operational effectiveness.

Additionally, RAFAEL will present a range of cutting-edge systems designed for aerial platforms, incorporating the latest technological advancements to counter emerging threats effectively. The "Litening" and "RecceLite" systems, equipped with advanced intelligence gathering capabilities, along with the "SPICE" family and "Ice Breaker" long-range precision-guided missile system, the "Sky Shield" electronic warfare system, and advanced air-to-air missiles will all be featured at the RAFAEL booth. These systems, already operational in numerous armed forces worldwide, offer upgrade possibilities for existing platforms, granting them capabilities equivalent to next-generation air platforms and systems.

Wednesday, June 14, 2023

We've Never Seen Anything Like The Solar System. Is It a Freak in Space?

SPACE 14 June 2023, By MICHELLE STARR

Illustration of the Solar System, not to scale.
(NASA)

Since the landmark discovery in 1992 of two planets orbiting a star outside of our Solar System, thousands of new worlds have been added to a rapidly growing list of 'exoplanets' in the Milky Way galaxy.

We've learnt many things from this vast catalogue of alien worlds orbiting alien stars. But one small detail stands out like a sore thumb. We've found nothing else out there like our own Solar System.

This has led some to conclude that our home star and its brood could be outliers in some way – perhaps the only planetary system of its kind.

By extension, this could mean life itself is an outlier; that the conditions that formed Earth and its veneer of self-replicating chemistry are difficult to replicate.

If you're just looking at the numbers, the outlook is grim. By a large margin, the most numerous exoplanets we've identified to date are of a type not known to be conducive to life: giants and subgiants, of the gas and maybe ice variety.

Most exoplanets we've seen so far orbit their stars very closely, practically hugging them; so close that their sizzling temperatures would be much higher than the known habitability range.

Artist's impression of an ultra-hot Jupiter transiting its star. (ESO/M. Kornmesser)



It's possible that as we continue searching, the statistics will balance out and we'll see more places that remind us of our own backyard. But the issue is much more complex than just looking at numbers. Exoplanet science is limited by the capabilities of our technology. More than that, our impression of the true variety of alien worlds risks being limited by our own imagination.

What's really out there in the Milky Way galaxy, and beyond, may be very different from what we actually see.

Expectations, and how to thwart them

Exoplanet science has a history of subverting expectations, right from the very beginning.

"If you go back to that world I grew up in when I was a kid, we only knew of one planetary system," planetary scientist Jonti Horner of the University of Southern Queensland told ScienceAlert.

"And so that was this kind of implicit assumption, and sometimes the explicit assumption, that all planetary systems would be like this. You know, you'd have rocky planets near the star that were quite small, you'd have gas giants a long way from the star that were quite big. And that's how planetary systems would be."

For this reason, it took scientists a while to identify an exoplanet orbiting a main sequence star, like our Sun. Assuming other solar systems were like ours, the tell-tale signs of heavyweight planets tugging on their stars would take years to observe, just as it takes our own gas giants years to complete an orbit.

Based on such lengthy periods of a single measurement, it didn't seem worth the trouble to sift through a relatively short history of observations for many stars to conclusively sift out a fellow main-sequence solar system.

When they finally did look, the exoplanet they found was nothing like what they were expecting: a gas giant half the mass (and twice the size) of Jupiter orbiting so close to its host star, its year equals 4.2 days, and its atmosphere scorches at temperatures of around 1,000 degrees Celsius (1800 degrees Fahrenheit).

Since then, we've learnt these 'Hot Jupiter' type planets aren't oddities at all. If anything, they seem relatively common.

We know now that there's a lot more variety out there in the galaxy than what we see in our home system. However, it's important not to assume that what we can currently detect is all that the Milky Way has to offer. If there's anything out there like our own Solar System, it's very possibly beyond our detection capabilities.

"Things like the Solar System are very hard for us to find, they're a bit beyond us technologically at the minute," Horner said.

"The terrestrial planets would be very unlikely to be picked up from any of the surveys we've done so far. You're very unlikely to be able to find a Mercury, Venus, Earth and Mars around a star like the Sun."

How to find a planet

Let's be perfectly clear: the methods we use to detect exoplanets are incredibly clever. There are currently two that are the workhorses of the exoplanet detection toolkit: the transit method, and the radial velocity method.

In both cases, you need a telescope sensitive to very minute changes in the light of a star. The signals each are looking for, however, couldn't be more different.

For the transit method you'll need a telescope that can keep a star fixed in its view for a sustained period of time. That's why instruments such as NASA's space-based Transiting Exoplanet Survey Satellite (TESS) is such a powerhouse, capable of locking onto a segment of the sky for over 27 days without being interrupted by Earth's rotation.

The aim for these kinds of telescopes is to spot the signal of a transit – when an exoplanet passes between us and its host star, like a tiny cloud blotting out a few rays of sunshine. These dips in light are tiny, as you can imagine. And one blip is insufficient to confidently infer the presence of an exoplanet; there are many things that can dim a star's light, many of which are one-off events. Multiple transits, especially ones that exhibit regular periodicity, are the gold standard.

Therefore, larger exoplanets that are on short orbital periods, closer to their stars than Mercury is to the Sun (some much, much closer, on orbits of less than one Earth week), are favored in the data.

The radial velocity method detects the wobble of a star caused by the gravitational pull of the exoplanet as it swings around in its orbit. A planetary system, you see, doesn't really orbit a star, so much as dance in a coordinated shuffle. The star and the planets orbit a mutual center of gravity, known as the barycenter. For the Solar System, that's a point very, very close to the surface of the Sun, or just outside it, primarily due to the influence of Jupiter, which is more than twice the mass of all the rest of the planets combined.

Unlike a transit's blink-and-you-miss-it event, the shift in the star's position is an ongoing change that doesn't require constant monitoring to notice. We can detect the motion of distant stars orbiting their barycenters because that motion changes their light due to something called the Doppler effect.

As the star moves towards us, the waves of light coming in our direction are squished slightly, towards the bluer end of the spectrum; as it moves away, the waves stretch towards the redder end. A regular 'wobble' in the star's light suggests the presence of an orbital companion.

Again, the data tends to favor larger planets that exert a stronger gravitational influence, on shorter, closer orbits to their star.

Aside from these two prominent methods, it's possible on occasion to directly image an exoplanet as it orbits its star. Though an extremely difficult thing to do, it may become more common in the JWST era.

According to astronomer Daniel Bayliss of the University of Warwick in the UK, this approach would uncover an almost opposite class of exoplanet to the short-orbit variety. In order to see an exoplanet without it being swamped by the glare of its parent star, the two bodies need to have a very wide separation. This means the direct imaging approach favors planets on relatively long orbits.

However, larger exoplanets would still be spotted more easily through this method, for obvious reasons.

"Each of the discovery methods has its own biases," Bayliss said.

Earth with its year-long loop around the Sun sits between the orbital extremes favored by different detection techniques, he said, so "to find planets with a one year orbit is still very, very difficult."

What's out there?

By far, the most numerous group of exoplanets is a class that isn't even represented in the Solar System. That's the mini-Neptune – gas-enveloped exoplanets that are smaller than Neptune and larger than Earth in size.


Illustration of the mini-Neptune TOI 560.01, orbiting its solitary star. (W. M. Keck Observatory/Adam Makarenko)



Most of the confirmed exoplanets are on much shorter orbits than Earth; in fact, more than half have orbits of less than 20 days.

Most of the exoplanets we've found orbit solitary stars, much like our Sun. Fewer than 10 percent are in multi-star systems. Yet most of the stars in the Milky Way are members of a multi-star systems, with estimates as high as 80 percent seen in a partnership orbiting at least one other star.

Think about that for a moment, though. Does that mean that exoplanets are more common around single stars – or that exoplanets are harder to detect around multiple stars? The presence of more than one source of light can distort or obscure the very similar (but much smaller) signals we're trying to detect from exoplanets, but it might also be reasoned that multi-star systems complicate planet formation in some way.

And this brings us back home again, back to our Solar System. As odd as home seems in the context of everything we've found, it might not be uncommon at all.

"I think it is fair enough to say that there's actually some very common types of planets that are missing from our Solar System," said Bayliss.

"Super Earths that look a little bit like Earth but have double the radius, we don't have anything like that. We don't have these mini-Neptunes. So I think it is fair enough to say that there are some very common planets that we don't see in our own Solar System.

"Now, whether that makes our Solar System rare or not, I think I wouldn't go that far. Because there could be a lot of other stars that have a Solar System-type set of planets that we just don't see yet."


This artist's illustration gives an impression of how common planets are around the stars in the Milky Way.
(ESO/M. Kornmesser)

On the brink of discovery

The first exoplanets were discovered just 30 years ago orbiting a pulsar, a star completely unlike our own. Since then, the technology has improved out of sight. Now that scientists know what to look for, they can devise better and better ways to find them around a greater diversity of stars.

And, as the technology advances, so too will our ability to find smaller and smaller worlds.

This means that exoplanet science could be on the brink of discovering thousands of worlds hidden from our current view. As Horner points out, in astronomy, there are way more small things than big things.

Red dwarf stars are a perfect example. They're the most common type of star in the Milky Way – and they're tiny, up to about half the mass of the Sun. They're so small and dim that we can't see them with the naked eye, yet they account for up to 75 percent of all stars in the galaxy.

Right now, when it comes to statistically understanding exoplanets, we're operating with incomplete information, because there are types of worlds we just can't see.

That is bound to change.

"I just have this nagging feeling that if you come back in 20 years time, you'll look at those statements that mini-Neptunes are the most common kind of planets with about as much skepticism as you'd look back at statements from the early 1990s that said you'd only get rocky planets next to the star," Horner told ScienceAlert.

"Now, I could well be proved wrong. This is how science works. But my thinking is that when we get to the point that we can discover things that are Earth-sized and smaller, we'll find that there are more things that are Earth-sized and smaller than there are things that are Neptune-sized."




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Sunday, June 11, 2023

Why Copper Is Now One of the World's Most In-Demand Metals | WSJ

7 Jun 2023

Copper demand has skyrocketed as the push for electrification of vehicles and energy sources continue to take over. The non-precious metal is important in the shift away from fossil fuels as it is critical for EVs, windmills, solar panels and even the entire power grid. So why aren't more companies starting new copper mines to fuel this boom in demand?

https://youtu.be/jP_t1lo0ZgA


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Friday, June 9, 2023

Researchers: We've created a new lens that could take thermal cameras out of spy films and put them in your back pocket

JUNE 8, 2023, S. Tonkin and
 J. M. Chalker, The Conversation


Credit: Shutterstock


Like something out of a spy movie, thermal cameras make it possible to "see" heat by converting infrared radiation into an image. They can detect infrared light given off by animals, vehicles, electrical equipment and even people—leading to specialized applications in a number of industries.

Despite these applications, thermal imaging technology remains too expensive to be used in many consumer products such as self-driving cars or smartphones.

Our team at Flinders University has been working hard to turn this technology into something we can all use, and not just something we see in spy movies. We've developed a low-cost thermal imaging lens that could be scaled up and brought into the lives of everyday people. Our findings are published in the journal Advanced Optical Materials.

Thermal imaging across industries

Thermal imaging has obvious applications in surveillance and security, given its ability to detect the heat signature of people. It's not surprising defense forces all over the world use this technology—including in Australia.

In medicine, it can be used to detect tissues of a higher temperature. This means thermal cameras are useful in the non-invasive detection of tumors, which run at a higher metabolism (and temperature) than healthy tissue.

Thermal imaging even plays a crucial role in space exploration. For instance, it can be used to image distant stars, galaxies and planets, because infrared light can penetrate dust clouds much better than visible light. NASA's James Webb Space Telescope also takes infrared images—and its ability to see far "redder" wavelengths is opening up new corners of the universe for us.

Addressing the high-cost conundrum

Above are just some examples in a long list of the specialized applications of thermal imaging. Yet this technology could have many more potential uses if it wasn't so expensive to produce.

The high cost comes, in part, from the materials used to produce the camera lenses. These lenses need to have special properties that allow them to be used with infrared radiation in a way standard lenses can't.

Most glasses and plastics will absorb infrared radiation, so expensive materials such as germanium or zinc selenide must be used. Both materials can be difficult to manufacture and maintain; germanium is a critical element in short supply, and zinc selenide contains toxic elements.


The lens is black and opaque. 
Author provided




Our team wanted to address the lens challenge head-on. We developed a new polymer made from the low-cost and abundant building blocks of sulfur and cyclopentadiene (an organic compound that takes the form of a colorless liquid).

The cost of the raw materials for the lens we've developed is less than one cent per lens. In comparison, some germanium lenses can cost thousands of dollars.

This new sulfur-based lens can also be molded and cast into a variety of complex shapes through common techniques used in the plastics industry. These techniques are simpler and less energy-intensive than those used to create conventional infrared lenses—further reducing the cost and making the polymer more scalable.

The key to developing this material was figuring out how to use cyclopentadiene as a gas for the reaction with sulfur. By doing this, we could precisely control the composition of the resulting polymer—leading to a lens with enhanced capabilities for thermal imaging.

Despite being completely opaque to visible light, the polymer has the highest long-wave infrared transmission of any plastic that has been reported—which means it can be used with a thermal imaging camera.

Possible applications

The development of this material opens doors to many new thermal imaging applications that weren't possible before.

Self-driving cars could use this technology to detect pedestrians or vehicles—even in low light or fog. Or it could be used in agriculture to monitor irrigation and crop health. Importantly, it would be affordable for farmers.

The new lens is also lightweight, which is helpful for aerial imaging by drone.

Finally, it could be integrated into consumer electronics such as smartphones, computers and home automation systems, to name a few. This would enable users to take thermal images or videos at any time from their phone. It could even be used to create next-generation smoke alarms.

The advances developed in this new study have significantly reduced the barrier to using thermal imaging—and may help revolutionize how it's used in our everyday lives.


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